At Clear Align we have literally hundreds of stock glass tooling called “testplates” that allow optical designers to save both time and money. Each radius in our testplate library comes complete with the testplate used for accurately measuring the radius as well as the various grinders, polishing hubs and other tooling required to make an optic of that radius accurate to 0.2% of the stated radius. The testplate library is available in such popular programs as Zemax.
In addition when a particular radius is not available then we also maintain a Zygo GPI (pictured above) interferometer and radius bench for measuring interferometrically the power and irregularity of any optic produced by our opticians. This data is critical for the production of our optics and also a very useful quality metric for assuring that the optic was made to the specification.